function shareTopic()
{	
	appendscript('http://static.movshow.com/js/global/messagebox.js', null, false, function(){
		_sendRequest('http://bbs.movshow.com/space/proxy.aspx?url=http://static.movshow.com/html/template/share.html', function(text){
			messageBox.showDialog("分享", text.format(document.title, topicid), true);
		}, false, null);
	});	
}